CA2037563A1 - Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences - Google Patents
Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differencesInfo
- Publication number
- CA2037563A1 CA2037563A1 CA 2037563 CA2037563A CA2037563A1 CA 2037563 A1 CA2037563 A1 CA 2037563A1 CA 2037563 CA2037563 CA 2037563 CA 2037563 A CA2037563 A CA 2037563A CA 2037563 A1 CA2037563 A1 CA 2037563A1
- Authority
- CA
- Canada
- Prior art keywords
- cased well
- methods
- measurement
- casing
- compensating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 title abstract 7
- 238000000034 method Methods 0.000 abstract 5
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 238000005755 formation reaction Methods 0.000 abstract 2
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention describes new methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. The invention also discloses multiple frequency methods of operation resulting in improved accuracy of measurement while the apparatus is simultaneously moved vertically in the cased well. The multiple frequency methods of operation disclose a first A.C. current having a first frequency that is conducted from the casing into formation and a second A.C. current having a second frequency that is conducted along the casing. The multiple frequency methods of operation simultaneously provide the measurement step and two compensation steps necessary to acquire accurate results while the apparatus is moved vertically in the cased well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2037563 CA2037563C (en) | 1986-11-04 | 1991-03-05 | Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/927,115 US4820989A (en) | 1986-11-04 | 1986-11-04 | Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes |
| US07/089,697 US4882542A (en) | 1986-11-04 | 1987-08-26 | Methods and apparatus for measurement of electronic properties of geological formations through borehole casing |
| CA 2037563 CA2037563C (en) | 1986-11-04 | 1991-03-05 | Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2037563A1 true CA2037563A1 (en) | 1992-09-06 |
| CA2037563C CA2037563C (en) | 2001-08-07 |
Family
ID=27168875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2037563 Expired - Lifetime CA2037563C (en) | 1986-11-04 | 1991-03-05 | Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2037563C (en) |
-
1991
- 1991-03-05 CA CA 2037563 patent/CA2037563C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2037563C (en) | 2001-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |